Angular Distribution of Neutrons fromO18(p, n)F18

Abstract

The reaction ${\mathrm{O}}^{18}(p, n){\mathrm{F}}^{18}$ has been studied using monoenergetic protons from the Rockefeller electrostatic generator. Resonances in the neutron yield in the forward direction are found at proton energies $E_p=2.657, 2.732, 2.778, 3.045, 3.170, 3.268, 3.386, 3.495, 3.600, \mathrm{and} 3.755$ Mev. The angular distribution of neutrons from this reaction at proton energies $E_p=3.045, 3.170, 3.268, \mathrm{and} 3.386$ Mev has been measured with a proton recoil counter. The most probable values of the spins of the excited states in ${\mathrm{F}}^{19}$ corresponding to these resonances are $J={\frac{3}{2}}^{\pm }, {\frac{1}{2}}^{\pm }, {\frac{3}{2}}^{\pm }, \mathrm{and} {\frac{1}{2}}^{\pm }$ respectively.